Lp=2Πr(r+t)
Lp=2×3,14×10(10+30)
Lp=2×31,4(40)
Lp=2×1.256
Lp=2.512cm²(A.)
--------------------
r=20cm
V=20³
V=8.000cm²
V=8dm³
V=8Liter(D.)
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Penyelesaian:
Lp=2Πr(r+t)
Lp=2×3,14×10(10+30)
Lp=2×31,4(40)
Lp=2×1.256
Lp=2.512cm²(A.)
--------------------
r=20cm
V=20³
V=8.000cm²
V=8dm³
V=8Liter(D.)